Drawing implement



Aug. 309 J. SOLARY DRAWING IMPLEMENT Filed April 14, 1924 WITNESS: ATTORNEY Patented Aug. 30, 1927.-

PArEar oEEicE.

JOHN soLAnY, or oHIoAGo HEIGHTS, iLLINoIs.

DRAWING IMPLEMENT.

Application filed April 14,

This invention relates to a drawing im-` plement, the general object of the invention being to provide-means for drawing arcs of circles, the radii of whichY are of such a length as to make it impossible to `use the ordinary compasses.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a diagrammatic view showing how the invention is used.

Figure 2 is a longitudinal sectional view through the device.

Figure 3 is a section on line 3 3 of Figure 2.

Figure 4l is a section on line 4 -4 of Figure 3. y

In these views, 1 indicates a body which is provided with a head 2 and a detachable point 3 which is preferably threaded to the lower end of the body. An arm l extends from the body to carry a spring pressed pin 5 which acts to hold the body in upright positionwhen placed on a surface the springV 5 of this pin acting to frictionally hold the pin in its adjusted position. The upper surface of the headis provided with teeth 6 and a shaft 7 passesthrough the body and is rotatably mounted therein. The shaft` is provided with a head 8 which is arranged above the head 2 and has secured thereto a casing 9 which encloses the head 2. A guideway is formed inthe head 8 for receiving a rod 10, said rod Vbeing provided with the rack teeth 11 for engagement by a toothed wheel 12 arranged on the shaft 13 rotatably mounted in the head 8 and which also carries a toothed wheel 14 which meshes with the teeth 6 on the head 2. The rod 10 has its outer end provided with a pencil receiving hole 15.V

It will thus be seen that when the casing 9 is rotated by the user, the shaft 13 will be rotated by means ofthe wheel 14 engaging the teeth 6 and thus the wheel 12 will be rotatetd to cause the rod 10to be moved. Thus by placing the device inthe proper 19,24..V Serial No. 706,489.

position on a portion of the radius of the circle to be drawn and revolving the casing in an anti-clockwise direction, the bar 10 will be gradually moved outwardly to trace the arc as shown in Figure 1. Thus I have produced simple means for drawing arcs of circles without the real center of the circles being indicated on the drawing board or sheet upon which the drawing is being made.

The device shown in the drawings has its parts so proportionedA that the body 1 must be placed midway the ends ofthe radius line of the circle on which the arc is to be drawn. Then the rod 10 is drawn out far enough to place the pencil in the'hole 15 on the end of the radius line. Then by operating the device as above described, the

arc will be drawn, as shown in Figure 1. Thus it is only necessary to find the center of the radius line of the circle of the arc to be drawn and place the body 1 thereon ivith the pencil at the end of the radius ine. Y

It is thought from the foregoing description that the advantages and novel features ofmy invention will be readily apparent.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

What I claim is :--Y

1. A device of the class described com-V prising a supporting member, a vertically arranged shaft rotatably mountetd inl the supporting member, a head on the shaft, a pencil carrying bar slidably mounted in the head, a circular rack on the supporting member concentric ywith the vertical shaft, a horizontal shaft arranged in the head, a toothed wheel on the horizontal shaft engaging the circular rack, a second toothed wheel on the horizontal shaft, a rack on the pencil carrying bar engaged by theV second toothed wheel and Ymeans for manually rotating the vertical shaft. Y

2. A device of the class described comprising a supporting member, a'vertically Wheel on the shaft. :1` mok on the pencil Carrying bm' engaged by Jhe second toothed wheei. means for inzunuiy rotating' The vel tieni shzifiih such menus Comprising,T nV easing Connected with the head of the veitizxl Shaft und enclosing the movable parte.

3. A device of the dass described 'o1nprsingr n` pointed nielifihel' having; :l` head provided with n eilenhw rack, :m :mn on the. pointed member, n. pin Carried by Jthe :nuh :i vm'lieaiiy :n'i'ungred Shaft' emi'iod by the Suid member, n head on che shaft, u.

peneii; Carrying' hm' slidahiy mounted in the second mentioned head and; imving rack teeth thereon, aV horizonte] shurlt Carried by the hond on the shnffh :1, toothed wheel ou said hoi'izoniai, Shaft meslling with the ruck on the penoih bm' und a second toothed wheel, on tho horizontal shaciiiengaging said eilonhu' iuvk.

in iestinflony whereof I :liix my Signature.

JOHN SOLARY. 

